#define _CRT_SECURE_NO_WARNINGS 1

#include"string.h"

int main()
{
	//xzy::test_string1();
	//xzy::test_string2();
	//xzy::test_string3();
	xzy::test_string4();

	/*std::string s1;
	std::string s2;
	cin >> s1 >> s2;
	cout << s1 << s2;*/

	/*char ch1, ch2;
	cin >> ch1 >> ch2;
	cout << ch1 << ch2;*/

	/*scanf(" %c %c", &ch1, &ch2);
	printf("%c %c", ch1, ch2);*/


	return 0;
}